2001663 has 12 divisors (see below), whose sum is σ = 2969928. Its totient is φ = 1298160.

The previous prime is 2001653. The next prime is 2001673. The reversal of 2001663 is 3661002.

It is a happy number.

2001663 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 663 = 666.

It is an interprime number because it is at equal distance from previous prime (2001653) and next prime (2001673).

It is not a de Polignac number, because 2001663 - 2⁸ = 2001407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2673 + ... + 3338.

It is an arithmetic number, because the mean of its divisors is an integer number (247494).

2^2001663 is an apocalyptic number.

2001663 is a deficient number, since it is larger than the sum of its proper divisors (968265).

2001663 is a wasteful number, since it uses less digits than its factorization.

2001663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6054 (or 6051 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 2001663 is about 1414.8013994904. The cubic root of 2001663 is about 126.0270161268.

Adding to 2001663 its reverse (3661002), we get a palindrome (5662665).

The spelling of 2001663 in words is "two million, one thousand, six hundred sixty-three".